Instructions Based on the first letter of your last name, find your assigned me

Instructions
Based on the first letter of your last name, find your assigned method below:
G–O: Statistics and terms used in ratio and interval values, My last name started with an J.
In your initial post on your assigned method, include the following information:
Define terms that you feel are relevant to your and your classmates’ understanding of your assigned type of statistics.
Give one example for each of your terms and provide a citation for where this example was found.
Explain in your own words the meaning of internal and external validity.
State how your assigned terms contribute to the validity, both internal and external, of research.
4. In your post , reference either material in the book or an external source to support your point. Don’t forget to cite your source.